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IPROUTE.md

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Guide: iproute

IPRoute is a fairly complex tool, but is still recommended in SCC365. For the course you can use iproute to list addresses of interfaces, and to bring links up/down.

📖 There is more iproute2 can do, see the ip man page for more!

Example: Listing Addresses

  • To list all addresses using ip, simply run: 
    ip a
    A response in the same format as below should be returned: 
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
     valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host 
     valid_lft forever preferred_lft forever
2: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN group default qlen 1000
  link/tunnel6 :: brd ::
3: h1-eth0@if21: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc htb state UP group default qlen 1000
  link/ether 7a:77:bc:5f:6e:e5 brd ff:ff:ff:ff:ff:ff link-netnsid 0
  inet 10.0.0.1/8 brd 10.255.255.255 scope global h1-eth0
     valid_lft forever preferred_lft forever
  inet6 fe80::7877:bcff:fe5f:6ee5/64 scope link 
     valid_lft forever preferred_lft forever
  • This example response shows that this given device has 3 interfaces. The points of note are the interfaces names (e.g. h1-eth0), the IP addresses (e.g. 10.0.0.1/8), the MAC addresses (e.g. 7a:77:bc:5f:6e:e5), and the link state (e.g. UP). However, the other information may also be useful in some scenarios.

💡 Tip: In Mininet, interfaces for a specific host can't be seen from the machine running Mininet, so run the ip a command from the host via the Mininet CLI: mininet> h1 ip a Also, interfaces on switches should be visible from the machine running Mininet.

Example: Setting Link State

  • To set an interface visible via the ip a command to a given state, you can use the link set command. For example, to set an interface called s1-eth0 to the DOWN state: 
    ip link set s1-eth0 down
  • The result of this can be checked via the ip a command.